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Share-Based Compensation and Benefit Plans (Deferred Compensation Plan Shares Table) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share Based Compensation Awards (Deferred Compensation Plan Awards) Table [Abstract]      
Non-qualified deferred compensation share awards $ 52,674 $ 77,230 $ 77,037
Change in classification   16,407 13,388
Change in redemption value   (669) 10,038
Diversification of share awards (52,674) (40,294) (23,233)
Non-qualified deferred compensation share awards $ 0 $ 52,674 $ 77,230